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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/6895
Tipo: Artigo de Periódico
Título: A spectroscopic study of Au/CeXZr1-XO2 catalysts
Título(s) alternativo(s): Brazilian Journal of Physics
Autor(es): Ferreira, Hadma Sousa
Varela, Maria do Carmo Rangel Santos
Ferreira, Márcio Luís Oliveira
Pepe, Iuri Muniz
Silva, Antônio Ferreira da
Autor(es): Ferreira, Hadma Sousa
Varela, Maria do Carmo Rangel Santos
Ferreira, Márcio Luís Oliveira
Pepe, Iuri Muniz
Silva, Antônio Ferreira da
Abstract: The nature of gold species in Au/CeXZr1-XO2 catalysts was successfully investigated using the visible and near infrared photoacoustic spectroscopy and Fourier transform infrared spectroscopy of adsorbed carbon monoxide. It was found that the visible and near infrared photoacoustic spectroscopy is a powerful technique for investigating the changes of gold particle size due to addition of zirconium and the oxidation state of gold particles. It was also noted that the increase of zirconium in the solids makes gold incorporation more difficult due to the electronic shielding caused by zirconium, decreasing the probability of replacing cerium by gold. For the samples studied, the particle size ranged from 20-30 nm and the Au+, Au3+ and Auº species were found in the catalysts.
Palavras-chave: Gold catalysts
Photoacoustic spectroscopy
CO adsorbed
URI: http://www.repositorio.ufba.br/ri/handle/ri/6895
Data do documento: Abr-2009
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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